As I was typing out a Fathers' Day message to my dad and brother, I noticed my iPhone tried to correct me. See, I like to use plural possessives for the following:

Fathers' DayMothers' DayandPresidents' Day

But Apple prefers the singular possessive, Father's Day.

Not true for Presidents' Day. For some reason, we have only one correction option, and the options aren't the same:

Here's a quick reminder in standard ' (apostrophe) use in North American English:

Type

Example

Possessor

Single owner/possessor

Rollie's mustache is glorious.

Rollie- Singular (one person owns the mustache)

Plural

The cats' litter box emitted odors.

Cats- Plural (a group owns the litter box)

Dual

Thelma and Louise's car was a beater.

Thelma and Louise-plural (two individuals own the car)

I prefer the consistency of thinking the holiday is to celebrate being a father, not being my father. Same with presidents and moms. The plural possessive makes the holidays more universal. Apple's chosen grammar is saying that Presidents' Day is a day to celebrate presidents, but Father's Day is a day to celebrate (one) father, presumably yours. I like the universal version more, so that's what I use.